Hello, my name is Pavel, and I will be supporting your case, I recommend review the next link.
LPC546XX Microcontroller (MCU) Family | NXP Semiconductors
On this you will be find the Document section where there is available the Datasheet and the Reference Manual, for some demos, could download the SDK and when you installed on the IDE could open the examples. On the link above there is some other application notes to run a demo.
Best regards,
Pavel